Oil Pressure Gauge - Operation

OPERATION

The oil pressure indicator gives an indication to the vehicle operator of the engine oil pressure. This indicator is controlled by the instrument cluster logic circuit based upon cluster programming, an input from the upper instrument panel switch pod, and electronic messages received by the cluster from the Powertrain Control Module (PCM) over the Controller Area Network (CAN) data bus.

The oil pressure indicator function of the reconfigurable dot matrix Organic Light Emitting Diode (OLED) display unit is completely controlled by the instrument cluster logic circuit, and that logic will only allow this indicator to operate when the instrument cluster receives a battery current input on the fused ignition switch output (run-start) circuit. Therefore, the OLED oil pressure indication will always be OFF when the ignition switch is in any position except ON or START. The instrument cluster will turn ON the oil pressure indicator for the following reasons:

- Oil Pressure Indicator Request - Each time the cluster is in the compass/trip computer mode and receives a request from the STEP button on the steering wheel to step to the appropriate sequence of the trip computer display, the oil pressure indicator will be displayed showing the current engine oil pressure value. The cluster receives electronic engine oil pressure messages from the PCM indicating the current pressure. The indicator remains illuminated until the cluster receives another request from the STEP button, until the cluster arbitrator logic determines that another display request has priority, or until the ignition switch is turned to the OFF position, whichever occurs first.

The PCM continually monitors the engine oil pressure sensor to determine the engine oil pressure. The PCM then sends the proper messages to the instrument cluster, also known as the Cab Compartment Node (CCN).

For proper diagnosis of the engine oil pressure sensor, the PCM, the CCN, the CAN data bus or the electronic communication related to oil pressure indicator operation a diagnostic scan tool is required. Refer to the appropriate diagnostic information.